how can i use scan command for CM energy for ebeam1 and ebeam2?

>set ebeam1 scan:[250,300,350,400,500,550,600,650,700,750,800,850,900,950,1000,1050,1200,1250,1300,1350,1400,1450,1500]
scan:[250,300,350,400,500,550,600,650,700,750,800,850,900,950,1000,1050,1200,1250,1300,1350,1400,1450,1500] can not be mapped to a float
Do you want to edit a card (press enter to bypass editing)?
/------------------------------------------------------------\
| 1. param : param_card.dat |
| 2. run : run_card.dat |
| 3. pythia8 : pythia8_card.dat |
| 4. delphes : delphes_card.dat |
\------------------------------------------------------------/
 you can also
   - enter the path to a valid card or banner.
   - use the 'set' command to modify a parameter directly.
     The set option works only for param_card and run_card.
     Type 'help set' for more information on this command.
   - call an external program (ASperGE/MadWidth/...).
     Type 'help' for the list of available command
 [0, done, 1, param, 2, run, 3, pythia8, 4, enter path, ... ]
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